Title:
DATA TRACE DEVICE
Document Type and Number:
Japanese Patent JP3532350
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To inexpensively realize a small trace function by constituting a data trace device so as to execute a data writing operation at higher speed than a reading operation and executing the refleshing of a dynamic memory for storing data which is outputted from a data storing means after the execution of the reading operation.
SOLUTION: 'H' and 'L' are repeated in a select signal SEL so that data of a signal T2 to be traced is successively stored in the dynamic memory (DEAM) 14. Therefore, time difference occurs between the generation of a bus cycle in a target CPU 11 and transfer to DRAM 14 but the data of the signal T2 to be traced is stored in the generation order of the bus cycle. Moreover, the reading of small capacitance storage elements 12a and 12b is executed at high speed than writing so that refreshing is executed in an obtained surplustime. Therefore, inexpensive and small DRAM 14 is used as the memory for storing data to be traced.
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Inventors:
Tajima, Naohisa
Application Number:
JP15993296A
Publication Date:
May 31, 2004
Filing Date:
June 20, 1996
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
MITSUBISHI DENKI SEMICONDUCTOR SOFTWARE KK
MITSUBISHI DENKI SEMICONDUCTOR SOFTWARE KK
International Classes:
G06F11/28; G06F11/22; G06F11/26; G06F11/34; G06F11/36; G06F12/00; G06F13/38; (IPC1-7): G06F11/28; G06F12/00
Attorney, Agent or Firm:
加藤 公延 （外１名）
田澤 博昭 （外３名）
田澤 博昭 （外３名）